a) = ( x - 3 )2 - ( 3x )2 = ( -2x - 3 )( 4x - 3 )
b) = x( x - 2y ) - ( x - 2y ) = ( x - 2y )( x - 1 )
a) \(\left(x-3-3x\right).\left(x-3+3x\right)\)
b) \(\left(x-2y\right).\left(x-1\right)\)
a) x2 - 6x + 9 - 9x2
= ( x - 3 )2 - (3x)2
= ( -2x - 3 ) ( 4x - 3 )
b) x2 - 2xy - x + 2y
= x( x - 2y ) - ( x - 2y )
= ( x - 2y ) ( x - 1 )